Liquid-fuel-control system



S. G. DOWN LIQUID FUEL CONTROL SYSTEM original Fiied July 5. 1919 RNEYi Patented May 6, 1924.

UNITED STATES 1,493,445 PATENT OFFICE.

SIDNEY G. DOWN, OF BERKELEY, CALIFORNIA, ASSIGNOIR.` T0 ASSOCIATED ENGINEER- ING AND SUPPLY COMPANY, 0F SAN-FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA;

LIQUID-FUEL-coN'raoLYs'rnm.

Original application Bled July 5i, 1919, Serial No. 308,886. I l'ivided and this application nled December 18, 1920. serial No. 431,769'.

To all 'whom it may concern):

Be it known that l, SIDNEY (i. DOWN, a citizen of the United States, residing at Berkele in the county of Alameda and State o California, have invented4 nevv and useful Improvements in Liquid-Fuel-Control Systems, of which the following is a specilication.

This invention relates to a Stearnboiler stokinv apparatushaving means foi` automatica ly regulating the intensity of the fire and the furnace draft, the present application being a division of my pending application, berial No. 308,886, filed July y5,1919, andA issued as Patent No. 1,375,492, dated April 19, 1921. Y

The present divisionalY application involves more particularly that feature ofthe invention in which variations in' the,forced draft effect the operation of delviceslfor regulating the intensity of thefi're, -including the regulation of the draft and the supply @ffnet y Other obiects and advantages will appear in tliev follevving more detailed description of the invention.

In .the accompanying a *diagrammatic side elevational nient, partly insection, of a liquid' fuel burning system embodyingm invention; Fig. 2 an endjel'evation thereo and Fig. 3.an enlargedsee.

tional vievv of thefuel controlling device.A

As shown. in thedrawiiig', tl'ie apparatus may comprise asteam Vboiler 1 having a furnacedoor opening'2` and a s mplre stack 3. For regulating the Howof liquidfuel a controlling device 4'is'provided which is adapted t'o operates. shaft 5 to'whicli is' operatively connected a sta'ck damper 6, a valve?- in the pipe for controlling the flow of fuel oil to the furnace, and an ash pit door 9.

In order to atomize the liquid fuel I provide an electric motor 10, to the shaft. 11 of which `is attached a conical disk ,12, the mountingbeing such that the disk 12 is positioned within the furnace, adjacent to the furnace door opening 2. p

The liquid fuel supply pipe 8 leads into the conical disk, so that as the liquid fuelt flows from the pipe into the disk, it is atomized and spra ed into the furnace by centrifugal action ue to the rapid revolution of the motor shaft 11.

The speed of the motor lO is controlled by drawing, Fig; 1 is;

and for effecting tle'om'eriin'lg o a rheostat 42 the contacta'rm 13 of which is operatively connected through a' rod 14 and a lever 15 with the shaft 5f The controller 4 may com rise a casing having piston chambers 1,6 an 17 containing the respective pistons'l8 and 19.'` The pistonA stems 20 and 21 of the respective pistons 18 and 19 are pivotally connected to a' cross head 22 which in turn is pivotally connected to a rod 23, and the rod23 is connected to a lever 24, secured to the shaft 5,

Thespace at the under side of each piston is connected by' pipe 25y to afnoil supply pipe whichl leads to a constant'source of fluid pressure, preferably utilizing the pressure of the liquid employed as fuel, as'shown in thek drawing. l

The, pistons 18 and 1 9 are provided with tlie` respcptive equalizing ports 26 and 27 throughl which the' fluidjlunder pressure below each piston tends to, equali'zelinto the spaceabo've the corresponding piston.

lValves 281a`nd29 having corresponding valvel Sterns 30 lareprevided'for effecting the exhaust of fluid under pressure above the respective pistons 18 aiid 19 to a Pip'e32 i T h'ejv'alves 28"a 'i1d 29 arevyieldingly held seated by the respective sp'rins 33 and 34 the valves, a @ress head 35 isp-rovi ed; having adjustable hand screwsf and`37 adapted to' engage the respectivel valves-'28 and 29.'v 4 n The cross head 35 is connected by ajstem 38 with' a flexiblediaphrgm 39,',s'ubject` on' one' side'to the pressure of ari adjustable coil spring 40, and onthe' opposite sde'to' steampressure, as supplied through pipe" 41y from the'st'ea-m' boiler 1.

The stack damper 6 is connected,` by' an arm 43, rod` 44 and lever 45with shaft 5, while the valve 7 is connected to said shaft throughv arm 4'6r`od 47', and lever' 48 The' ash' pitdorS may be operated by a 4chain 49 adapted to engage a sheave 50 on the shaft 5'.

A weighted' arm 51 is connected to the lshaft 5 and tends to rotate the shaft by gravity.

diaphragm will move the rod 38 to its lowermost position, in which the screws 36 and 37 engage both valves 28 and 29 and open same.

Li uid fuel under pressure, previously equalized into the chambers above the pistons 18 and 19 through the ports 26 and 2, is then exhausted through pipe 32, so that said pistons are shifted to their uppermost positions bythe pressure of liquid acting below the pistons.

Therod 23 is then raised by the pistons 18 and 19 so as to effect the partial rotation of shaft to the positionfshown in Fig. 1 of the drawing. f y

In this position, thevalve 7 is closed to a predetermined yextent so as to lprovide the desired ,-rateof 'low of` liquid :fuel for a miniln'xifire'.' The rheostat arm 13 is in position' for cuttingv resistance into the cir cuit Aof thelotor 10 so that'said motor roi tatesithe shaft `11 and the conical disk 12 at `a minimumspeed.A

,The liquid fuel flowing' through pipe 8 to the'disk 12"i s thenthrown out by centrifugal foroeandlis atomized and sprayed into the furnace.

vIn this position, the rod 44 operates the stack'damper 6 so asto restrict the draft to correspond withtherestricted fire and the ash pit`door 9 is als'oinoved torestrict the draft throughV theash pit.A

It mayherebe stated that the screws 36 and 37 are so adjusted that thescrew`37 is nearerthelvalve. stem 31 than the'screw 36 to the valve' stem'30, asxshown in Fig. 3 of the drawing, with ltheresultthat when the diaphragm 39 moves the cross head 35 downwardly, the screw. 37 will engage thevalve stem 31 and open the valve 29 before the screw 36 engages thevalve stem `30 to open the valve 28. On 4the upward movement of the diaphragm 39, the movement of the cross head 35 will cause the screw 36 to more away from the valve stem 30 before the screw 37 moves away from the valve stem 31, so that the valve 28 will close first dur` ing the upward movement vof the diaphragm.

If the steam pressure in the boiler reduces to a predetermined degree` `the pressure of the spring' 40 will move the diaphragm 39 against the reduced steam pressure, so as to move the cross head 35 upwardly and first permit the valve 28 to close while the valve 29 remains open. The liquid pressure on the under side of the piston 18 will then equalize through the restricted port 26 permitting the piston 18 to move down and thereby rotate the shaft 5 through the rod 23 and the lever 24.

The rotation of shaft 5 causesthe valve 7 to be opened wider. so that an increased fion' of liquid fuel is supplied to the flsl-i 12 while the rheostat arm 13 is moved to eut resistance out of the circuit of the fno tor 10, so that the motor will speed up to correspond with the increased flow of liquid fuel The stack damper 6 and the ash pit door 9 are also moved to provide 'an increased draft in accordance with the requirements ol the increased furnace fire.

If the steam pressure in the boiler continues to fall, the spring 40 will move the diaphragm 39 and rod 38, so as to permit the closing of valve 29 and the consequent equalization of pressures on opposite sides oi the piston 19.

The piston 19 then moves downwardly and causes the further rotation of shaft 5, so that the valve 7 is opened still wider, while the rheostat arm 13 is again shifted to cut out more resistance from the motor circuit and thus permit the further speeding up of` the motor 10.

As will be evident. the stack damper 6 and the ash pit door 9 are also operated to provide a further increase in the draft openings. i

Vl'vhen the steam pressure rises `above `a predetermined degree, the diaphragm 39is depressed by the increased steam pressure so as to shift the cross head 35 downwardlv to first open the valve 29 while the valve 28 remains closed. Liquid under pressure .is then vented from the chamber above piston 19, so that said piston is operated b ,'th'e liquid under pressure below the pistonv 'and the rod 23 operates to rotate the shaft`5, so that the stack damper 6 and thevash-'pit door 9 are partly closed, while the valve 7 lis operated to reduce the flow of liquid fuel through pipe 8 and the speed of the motor 10 is reduced by the operation of the rheostat arm 13 tocut resistance into the motory circuit.

If the steam pressure rises still further;

the diaphragm 29 is moved further b v steam pressure so as to cause the cross head 35 to operate the valve 28 and vent liGuid from the top 0f piston 18. Said piston then lifts therod 23 and rotates the shaft 5 a further amount. so that the speed of the motor and the tlow of liquid fuel is further reduced, while the stack damper 6 and the ash pit door 9 are further closed, to reduce t c draft. to correspond with the reduced fire'.

The construction as so far described constitutes the subject matter upon which the claims in my pending application, hereinbefore referred to. are based. and I will now describe the construction and operation with respect to control bv variations in forced draft and relating more specifically to the subject matter claimed in the present divisional application.

If forced draft be employed, means ma)7 he provided for operating the controller l accordingr to variations in the degree of forced draft.

llU

For this purpose, an auxiliary valve device 5l is provided, comprising a casing containing a diaphragm 52, su'bJect on one side to a spring 53 and having a stem 54 for operating a valve 55 adapted to control the venting of liquid from the iston chamber 17 of the controller 4. he chamber above the diaphragm is connected by a pipe 56 to the interior of the usual steam nozzle 57, which is mounted in the smoke stack 3 for producing forced draft.

In operation, if the forced draft is operating, the pressure of steam in the nozzle 57 acts on the diaphragm 52, against the resistance of spring 53 to hold the valve 55 closed, so that the controller then operates as hereinbefore described.

If, however. the forced draft is shut off. then the pressure above the diaphragm 52 will be reduced, enabling the spring 53 to operate the diaphragm t0 open the valve 55 and vent liquid above piston 19 to the exhaust.

The piston 19 will then be lifted by the liquid pressure acting below the piston, so as to rotate the shaft 5 to a position for reducing the intensity of the fire.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

l. In a steam boiler stoking apparatus, the combination with a steam boiler, of means for controlling the supply of fuel to the boiler furnace, a piston operatively connected to said means and responsive t0 a differential of pressures on its opposite sides for operating said means, a valve for establishing a differential of pressures on said piston, a diaphragm subject to variations in steam boiler pressure for operating said valve, and a valve device operated by variations in pressure of exhaust steam from an engine operated by steam from the boiler for also creating a differential pressure on aid piston.

2. In a steam boiler stoking apparatus, -he combination with a steam boiler, of neans for regulating the atomizing of liquid fuel supplied to the boiler furnace, a piston operatively connected to said means and responsive to a differential of pressures on its opposite sides for operating said means, a controlling device subject to variations in steam boiler pressure for establishing a differential of' pressures on said piston, and a valve device operated b variations in pressure of exhauststeam rom an engine operated by steam from the boiler for also creating a differential pressure on said piston.

3. In-a steam boiler stoking apparatus, the combination with a steam boiler, of means for regulating the furnace draft a piston operatively connected to said means and responsive to a differential of pressures on its opposite sides for operating said means, a main controlling device subject to variations in steam boiler pressure for establishing a differential of pressures on said piston, and an auxiliary valve device subject to variations in the pressure of exhaust steam from an engine operated by steam fro-m the boiler for also creating a differential pressure on said piston.

4. In a steam boiler stoking apparatus, the combination with a steam boiler, of mechanism for regulating the supply of liquid fuel to the boiler furnace, for regulating the atomizing of the liquid fuel, and for regulating the furnace draft, a piston operatively connected to said mechanism and responsive to a differential of pressures on its opposite sides for operating said mechanism, a main controlling device subject to variations in steam boiler pressure for establishing a differential of pressures on said piston, and an auxiliary valve device subject to the variations in the pressure of the exhaust steam from an engine operated by steam from the boiler for also creating a differential pressure on said piston.

In testimony whereof I have hereunto set my hand.

SIDNEY G. DOWN. 

